British and South African authorities have made a record heroin seizure following on operation at London’s Heathrow Airport and raids in both countries, officials said last week.

Immigration officials discovered some of the drugs hidden in souvenirs from South Africa at Heathrow, sparking an investigation that netted 360 kilograms (793 pounds) of heroin in total, the UK Border Agency said.

Seven people have been arrested in both countries over the total seizure, worth 27 million euros or 41 million dollars, the agency said.

Thousands of kilograms of cannabis were also discovered, the agency said.

About 165 kilograms were discovered at Heathrow, a record seizure for the world’s busiest airport, on September 9 in the consignment of souvenirs.

After an investigation, police seized another 80 kilograms and arrested two people in Kent, southeast England, charging one with conspiracy to import drugs and possession, the agency said.

Acting on information from Britain, South African police arrested five people, including three British nationals, and seized 115 kilogrammes of heroin and 6,500 kilogrammes of cannabis in a warehouse outside Durban.

“These seizures are a great example of what can happen when partners work together, said Britain’s Serious Organised Crime Agency deputy director Andy Sellers.

“Both ends of this international chain have been attacked, and a significant amount of heroin and cannabis has been kept off the UK’s streets.” Sapa